Bigroger
70cc twin V2
I went with the FUTABA bls157 all round on my 91" and they are amazingly solid, strong and fast.I get asked that all the time. The 91 control surfaces are almost the same size as the 104 and it is of course smaller and lighter. The DA-120 is proportionally more powerful, but now that I have about 150 flights on the DA-60/RE2 it has great power, it is only slightly behind. Clearly the 91 with 1 servo per aileron needs the best servos you can find. Originally I had 7955's which were an epic fail, so they were replaced with Savox 2270's and it is much better but could still use a bit more. I would say that the 91 is 95% of the capability at 1/2 the cost and the reason I fly it so much is it is easier to transport, set up and fly.
I've seen guys flying the 104 on da120 and the power was much better then the da60/re2 on my 91" from my opinion. Just looking at punch out from hover the da120 seems double the performance of th da60 on an airframe that's only a few kg heavier.
I've got the da70 running in the 88" egde now and love it. This truly is electric type foamy power, but god does its leave my ears ringing after a lot of down low close 3D flying.